Boring and grinding machine



Feb. 9, 1932.

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BORING.AND GRINDING MACHINE Filed May 27, 1929 4 Sheets-Sheet 2 F I G. 2.

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S. FRYCKBERG BORING AND GRINDING MACHINE 4 Sheets-Sheet 5 Filed May 27, I929 FIGS.

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BQRING AND GRINDING MACHINE Filed Mai 27. 1929 4 Sheets-Sheet! 4 .251 an tor Jan: 1: e Z Fig airbag Fatented Feb. 9, 1932 UNITED stares tea SAIE IUEL FR YCKBERG, OF PORT WASHINGTON, VISGONSIN, ASSIGNOR T0 SIMPLICITY MANUFACTURENG COMPANY, OF PORT W'ASHINGTGN, WISCONSIN, A CORPORATION OF 'WISGGNSIN BORING AND GRINDING MACHINE Application filed May 27, 1929. Serial No. 366,480.

This invention relates to a boring and grinding machine.

The machine to which the invention applies in particular is illustrated and described in Patent No. 1,789,536, issued December 17, 1929, to Joseph Appleton, and has a horizontal base for attachment to an engine cylinder, a vertical standard carried by the base, a tubular outer shaft arranged in the standard to rotate and slide therein, a feed screw arranged alongside and connected to the outer shaft to support the same and to moveit vertically, an inner shaft carried in the outer shaft and rotatable independently thereof to drive a grinding tool, a rotary driver arranged alongside the outer shaft, and a drive connecting the inner shaft and the driver and movable with the inner shaft along the driver.

The object of the invention is to provide a machine of this character which will remain precise in operation after a long period of use.

Another object is to prevent the feed from overrunning.

Another object is to maintain auniform tension on the belt which drives the inner or grinding shaft.

According to the invention as it is ordinarily embodied, friction means are employed to prevent the feed nut from overrunning, a spring pressed pulley maintains the tension of the driving belt and the outer shaft 1s journaled in a take-up hearing which is adjustable to compensate for wear, all of which cooperate to obtain precision over a long period of use.

A machine embodying the invention s shown in the accompanying drawings in which the views are as follows:

Fig. 1 is a side elevation of the machine partly in section, as indicated by the irregular line 11 of Fig. 2.

Fig. 2 is a top plan view of the feeding mechanism and the inner shaft drive, taken on the line 22 of Fig. 1.

Fig. 3 is a vertical section through the upper part of the machine, taken onthe line 3-3 of Fig. 2.

Fig. 4 is a side view of the take-up bearing: bushing.

s Fig. 5 is a section on the line 5+5 of F1g. 4.

Fig. 6 is a sect-ion on the line 66 of Fig. 4-.

Fig. 7 is a central longitudinal section through the take-up bearing sleeve.

Fig. 8 is a section on the line 88 of Fig. 7.

The mechanism of the machine is carried by a frame having a horizontal base 1 for attachment to an engine cylinder, a vertical standard 2 which may be formed integral with the base 1, and an upper frame or housing 3 arranged upon the standard.

The standard 2 has a vertical bore 4 which tapers inwardly from each end thereof and contains a take-up bearing 5 in which a tu-" bular outer shaft 6 is journaled and adapted to carry either a boring tool or a grinding tool at its lower end.

The shaft 6 is supported'and moved vertically by a shaft carrier 7 having a thrust bearing connection with the flangedhead 8 of the shaft 6 and with a rotatable feed nut 7 9 which forms a part of the shaft carrier and is threaded upon a feed -screw 10 arranged alongside the shaft 6 and journaled in the base 11 and the top 12 of the upper frame 3.

The feed screw 10 is held against rotation when the machine is in operation by a thumb Screw 13 threaded through a hand crank let which is attached to the upper end of the feed, screw and which may be rotated to raise and lower the'shaft 6 manually.

The feed nut 9 is rotated, to move the same along the feed screw 10 and advance the shaft 6, by feed pins 15 which are arranged in sockets in the head 8 and engage teeth 16 formed on the upper flangeof the feed nut 9. B5

The outer shaft 6 is driven by a motor 17 which is arranged upon the standard 2 and connected by a train of gears 18 to a gear19 splined on the shaft 6. I c

'The gear 19 is arranged in a recess formed to in the top of the standard 2 and held against vertical movement by the base 11 of the upper frame 3 which may also carry a plate 20 to enclose the gear train 18.

The grinding tool is driven by an inner or grinding shaft which is carried in the outer shaft 6 and has an upper section 21 arranged in bearings 22 and a lower section 23 having a ball and socket connection 2/1 7 with the section 21 and a ball and pin connection at its lower end to form a universal joint with the grinding spindle 26 of the grinding tool.

The upper section 21 of the grinding shaft has a driving pulley 27 fixed to its upper end and spaced by suitable sleeves from the bearings 22 to support the grindin shaft in the shaft 6 and permit independent rotation thereof.

A belt 28 connects the pulley 27 with a driving pulley 29 splined on a driving shaft 30 which has its upper end journaled on a stub shaft 31 carried by the top 12- of the upper frame 3 and its lower end connected to the shaft of the motor 17.

The hub of the driving pulley 29 is journaled in a bearing 32 carried by the shaft carrier 7 and is fixed for vertical movement therewith so that the inner shaft drive is moved positively along the driving shaft 30 as the outer and the inner shafts move vertically. I

In order that the operation of the machine be precise, the grinding tool must be rotated at a constant speed.

This is accomplished by an automatic belt tightener 33 which maintains a uniform tension upon the belt 28.

The belt tightener has an idler pulley 34 engaging the belt 28 and journaled on the vertical leg of an angular pulley support 35 which has its horizontal leg slidably arranged in a bearing'36 carried by the shaft carrier 7, as shown in Figs. 2 and 3. v

The horizontal leg is bored to receive a spring 37 which urges the pulley 34 against the belt 28 and is arranged between a stop 38 carried by the bearing 86 and an adjusting screw 39 which is threaded into the end of the horizontal leg of the support and adapted to adjust the tension of the spring.

A grinding wheel 40 is secured to the grinding spindle 26 which is journaled in a bearing 41 pivoted on the head 42 of the grinding tool and adapted to be adjusted cccentrically thereto by an adjusting mechanism 43 so that, when the machine is in operation, the grinding wheel is given a plane-, tary movement by the shaft 6 to move the same around the periphery of a cylinder. rotated at high speed by the inner shaft to grind the cylinder and fed longitudinally thereof by the feeding mechanism.

\Vhen a boring tool (not shown) is attached to the outer shaft, the inner shaft performs no useful function.

In order that the machine operate with extreme precision, the boring or grinding tool should be advanced through the cylinder at a constantly uniform rate.

This is accomplished by providing spring pressed fingers 44 which engage the teeth 16 and prevent the feed nut 9 from overrunning after each impulse is received from the feed pins 15.

Pins 45 extend upwardly from the shaft carrier 7 and pivotally support the fingers 44 which are urged againstthe teeth 16 by a spring 46 having theends thereof attached to lugs 44' carried by the fingers.

The take-up bearing 5 is adapted to compensate for wear and is so constructed that it may be contracted or expanded throughout its length to provide an accurate and close fitting bearing at all times and enable the machine to produce work of great accuracy.

The bearing bushing 48 of the take-up bearing 5 has a tapered part 49 to fit the tapered upper part of the bore 4 and a cylindrical part 50 which is provided at its lower end with threads 51 and embraced by a takeup sleeve 52 having the outside thereof taperedto lit the lower tapered part of the bore 4.

The threads 51 are engaged by a nut 53 which is swiveled on the end of the sleeve 52 and held against removal therefrom by a snap ring 54 of spring Wire arranged in cooperating grooves formed in the sleeve and the nut, as shown in Fig. 7.

The sleeve 52 is held against rotation relatively to the bushing 48 by a gib 55 carried by the sleeve and engaging a keyway 56 formed in the cylindrical part 50.

The take-up bearing is held against rotation in the bore 4 by gibs (not shown) car ried by the standard 2 and engaging lreyways 57 and 58 formed in the bushing 48 and the sleeve 52, respectively. I

Contraction of the take-up bearing is permitted by aslit 59 in the sleeve 52, a slit 60 extending the entire length of the bushing 48, slits 61 and 62 extending the length of the tapered part 49, and deep grooves 63, 64 and 65 formed in the outer surface of the tapered part 49 and extending the length thereof.

The bushing 48 may be provided with oil grooves 66 and oil holes 67 to permit lubricant to seep from the inside of the cylindrical part 50 to the outside thereof to prevent the take-up sleeve 52 from adhering thereto.

.The nut 53 is provided With holes 68 to receive a spanner wrench by means of which the nut may be rotated to move the sleeve 52 upwardly, thus wedging the sleeve 52 and the tapered part 49 into the tapered parts of the bore 4 and causing a uniform contraction of the take-up bearing throughout the entire length thereof.

By rotating the nut 53 in the opposite direction, the snap ring 54 draws the take-up sleeve 52 downwardly and allows the take-up bearing to expand and also permits the takeup sleeve to be removed from the bore 4.

A machine constructed in this manner is precise in operation and remains precise after a long period of use as the take-up bearing permits the shaft 6 to hold the boring tool or the grinding tool accurately to the work, the grinding wheel is driven at a uniform speed as the belt tightener maintains a constant and uniform tension on the belt, and

the tool is advanced uniformly dueto the fingers 4A preventing overrunning of the feeding mechanism.

The invention herein set forth is susceptible of various modifications without departing from the scope thereof as hereafter claimed.

The invention is hereby claimed as fol lows:

1. A boring and grinding machine comprising a frame having a take-up bearing arranged vertically therein, an outer shaft journa-led in said bearing, a drive to rotate said shaft, an inner shaft carried in said outer shaft and adapted to drive a tool, a feed to move said shafts vertically, means to prevent said feed from overrunning, a rotary driver arranged alongside said outer shaft, and a drive connecting said inner shaft and said driver and movable with said inner shaft along said driver.

2. A boring and grinding machine comprising a frame having a take-up bearing arranged vertically therein, an outer shaft journaled in said bearing, a drive to rotate said shaft, an inner shaft carried in said outer shaft and adapted to drive a tool, a feed 0perated by said outer shaft to move said shafts vertically, means to prevent said feed from overrunning, a rotary driver arranged alongside said outer shaft, and a drive connecting said inner shaft and said driver and movable with said inner shaft along said driver.

3. A boring and grinding machine comprising a vertical outer shaft, a drive to rotate said shaft, a feed screw arranged alongside said shaft, a nut threaded on said feed screw and connected to said shaft to support the same, means to rotate said nut and advance said shaft, means to prevent said nut from overrunning, an inner shaft carried in said outer shaft and adapted to drive a tool, a rotary driver arranged alongside said outer shaft, and a drive connecting said inner shaft and said driver and movable with said inner shaft along said driver.

4. A boring and grinding machine comprising a vertical outer shaft, a drive to rotate said shaft, a feed screw arranged alongside said shaft, a nut threaded on said feed screw and connected to said shaft to support the same, means operated by said outer shaft to rotate said nut and advance said shaft, means to prevent said nut from overrunning, an inner shaft carried in said outer shaft and adapted to drive a tool, a rotary driver arranged alongside said outer shaft, and a drive connecting said inner shaft and said driver and movable with said inner shaft along said driver.

5. A boring and grinding machine comprising a vertical outer shaft, a drive to rotate said shaft, a feed screw arranged along: side said shaft, a nut threaded on said feed screw and connected to said shaft to support the same, means to. rotate said. nut and advancesaid shaft, aspring pressed finger engaging said nut to prevent the same from overrunning, an inner shaft carried in said outer shaft and adapted to drive a tool, and a driver to rotate said inner shaft.

6. A boring and grinding machine comprising a vertical outer shaft, a drive to rotatesaid shaft, a feed screwarranged alongside said shaft, a nut threaded on said feed screw and connected to said shaft to support the same, means to rotate said nut and advance said shaft, fingers engaging opposite sides of said nut to prevent the same from overrunning, a spring connecting said fingers to hold the same in en agement with said nut, an inner shaft carried in said outer shaft and adapted to drive a tool, and a driver to rotate said inner shaft.

7. A boring and grinding machine comprising a vertical outer shaft, a drive to rotate the same, a feed screw arranged alongside said shaft, a feed nut threaded on said feed screw, a shaft carrier supported by said feed nut and connected to said shaft, means to rotate said nut and move said shaft vertically, an inner shaft carried in said outer shaft, a driven pulley fixed on said inner shaft, a driving shaft arranged alongside said outer shaft, a driving pulley splined on said driving shaft and fixed for vertical movement with said shaft carrier, a belt connecting said pulleys, and a spring pressed pulley carried by said shaft carrier and engaging said belt to maintain the tension thereof.

8. A boring and grinding machine comprising a vertical outer shaft, a drive to rotate the same, a feed screw arranged alongside said shaft, a feed nut threaded on said feed screw, a shaft carrier supported by said feed nut and connected to said shaft, means to rotate said nut and move said shaft vertically, an inner shaft carried in said outer shaft, a driven pulley fixed on said inner shaft, a driving shaft arranged alongside said outer shaft, a driving pulley splined on said driving shaft and fixed for vertical movement with said shaft carrier, a belt connecting said pulleys, a pulley support slidably arranged in said shaft carrier, an idler pulley carried by said pulley support, and

a spring engaging said pulley support to urge said idler pulley against said belt.

9. A boring and grinding machine comprising a frame having a vertical bore tapering inwardly from the endsthereof, a split bushing arranged in said bore and having a tapered part fitting one end thereof, a tapered take-up sleeve embracing said bushing and fitting the other end of said bore, a nut threaded onto said bushing and attached to iii;

said sleeve, av rotatable and slidable outer shaft arranged in said bushing and adapted to carry a tool, a drive to rotate said outer shaft, an inner shaft carried insaid outer shaft and adapted .to drive a tool, a feed to move said shafts vertically, means to prevent said feed from overrunning, a driver to -ro-' tate said inner shaft.

10. A boring and grinding machine comprising a frame having a vertical bore tapering inwardly from the ends thereof, a split bushing'arranged in said bore and having a tapered part fitting one end thereof, a tapered take-up sleeve embracing said bushing and fitting the other end of said bore, a nut threaded onto said bushing and attached to said sleeve and adapted to be advanced along said bushing to contract the same throughout the length thereof and to be retracted to allow said bushing to expand, means to hold said sleeve against rotation, a rotatable and slidable outer shaft arranged in said bushing and adapted to carry a tool, a drive to rotate said outer shaft, an inner shaft carried in said outer shaft and adapted to drive a tool, a feed to move said shafts vertically, means to prevent said feed from overrunning, a driver to rotate said inner shaft.

In Witness whereof, I have hereunto subscribed my name.

SAMUEL FRYCKBERG.

CERTIFICATE OF CGRREGTION.

. February 9, 1932.

Patent No. 1,844,317.

SAMUEL FRYCKBERG.

is is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as ieliows: Page-4, lines 7 and 28, claims 9 and 1%, before the article "an" insert the word and; andthat the said Letters Patent should he read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 12th day of 31113 A. i). 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

